IBC INTERSTAR IWT Series, Инструкция по установке и эксплуатации

Страница: 26 / 40

24
4.0 Electrical
Danger
Do not connect thermistor sensors to “Therm” terminals on the IBC control board. It could
result in overheating, potentially causing serious personal injury and/or property damage.
1. Install electric wiring and grounding according to the National Electrical code and local
regulations.
2. Water heaters are not supplied with an aquastat. For field-supplied aquastats, follow the wiring
instructions supplied with the aquastat and the installation instructions of the boiler being
connected to the water heater.
3. All water heaters are supplied with a 10KΩ temperature sensor that connects to the IBC control
board “DWH Sensor” terminals with standard 2-wire, 18 gauge thermostat wire. For other boiler
models, an aquastat thermostat is required.
4. In addition, refer to the Installation manual of the boiler.
4.1 Temperature sensor
The temperature sensor supplied with the IBC indirect water heater is an NTC Thermistor type with a
resistance of 10,000 ohms at 25°C and β = 3892. IBC does not recommend using 3rd party sensors.
IBC distributors can supply compatible water temperature sensors.
The resistance of the temperature sensor varies inversely with temperature. To test, measure the
temperature of the sensed environment and compare with the value derived from the measurement of
the resistance (obtained by connecting a good quality test meter capable of measuring up to 5,000 kΩ
(5,000,000Ω) at the controller end of the sensor lead).
To obtain a resistance reading, remove power to the boiler. When taking the reading, you must
disconnect the sensor leads from the terminal strip. Do not grip the sensor leads in your hands or place
them on or against a conductive surface or the reading will be compromised. Place multi-meter probes
onto the bare wire ends of the leads and obtain the reading. Compare the reading with the actual sensor
temperature and the resistance value listed for that temperature in the table below. Do not apply voltage
to the sensor (damage may result).
Warning
The Thermistor temperature sensor supplied with the IBC water heater is may not to be
compatible with other makes of boiler or controls, and its use may create a hazardous
condition.
Do not use the IBC sensor with other appliance makes. IBC indirect water
heaters are supplied with a 10kΩ thermistor sensor for inserting into the temperature well of
the tank, and securing with a retainer clip or cap. You must solidly affix the thermistor to
prevent it from falling out or from being pulled out. If the sensor is pulled out of the well, a
continuous call for hot water will be generated, resulting in elevated tank temperatures and
risk of scalding.